Unity3d standard surface particle stream shader error in unity 2019 - unity3d

Question

I've been trying to make the shader example from unity's website to compile in unity3d 2019.
Shader "Custom/test" {
Properties {
_Color ("Color", Color) = (1,1,1,1)
_MainTex ("Albedo (RGB)", 2D) = "white" {}
_Glossiness ("Smoothness", Range(0,1)) = 0.5
_Metallic ("Metallic", Range(0,1)) = 0.0
}
SubShader {
Tags {"Queue"="Transparent" "RenderType"="Transparent"}
Blend SrcAlpha OneMinusSrcAlpha
ZWrite off
LOD 200
CGPROGRAM
// Physically based Standard lighting model, and enable shadows on all light types
#pragma surface surf Standard alpha vertex:vert
// Use shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0
sampler2D _MainTex;
struct appdata_particles {
float4 vertex : POSITION;
float3 normal : NORMAL;
float4 color : COLOR;
float4 texcoords : TEXCOORD0;
float texcoordBlend : TEXCOORD1;
};
struct Input {
float2 uv_MainTex;
float2 texcoord1;
float blend;
float4 color;
};
void vert(inout appdata_particles v, out Input o) {
UNITY_INITIALIZE_OUTPUT(Input,o);
o.uv_MainTex = v.texcoords.xy;
o.texcoord1 = v.texcoords.zw;
o.blend = v.texcoordBlend;
o.color = v.color;
}
half _Glossiness;
half _Metallic;
fixed4 _Color;
void surf (Input IN, inout SurfaceOutputStandard o) {
fixed4 colA = tex2D(_MainTex, IN.uv_MainTex);
fixed4 colB = tex2D(_MainTex, IN.texcoord1);
fixed4 c = 2.0f * IN.color * lerp(colA, colB, IN.blend) * _Color;
o.Albedo = c.rgb;
// Metallic and smoothness come from slider variables
o.Metallic = _Metallic;
o.Smoothness = _Glossiness;
o.Alpha = c.a;
}
ENDCG
}
FallBack "Diffuse"
}
But the compilation gives an error:
Shader error in 'Custom/test': invalid subscript 'texcoord' at line 157 (on d3d11)
I suspect there is a difference between unity 2017 for which the example was made and unity 2019, but i can't figure out what the problem is.

Answer 1

Managed to figure it out:
Shader "Custom/StandardTransparentQueue" {
Properties {
_Color ("Color", Color) = (1,1,1,1)
_MainTex ("Albedo (RGB)", 2D) = "white" {}
_Glossiness ("Smoothness", Range(0,1)) = 0.5
_Metallic ("Metallic", Range(0,1)) = 0.0
}
SubShader {
Tags {"Queue"="Transparent" "RenderType"="Transparent"}
Blend SrcAlpha OneMinusSrcAlpha
ZWrite off
LOD 200
CGPROGRAM
// Physically based Standard lighting model, and enable shadows on all light types
#pragma surface surf Standard alpha vertex:vert
// Use shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0
sampler2D _MainTex;
struct appdata_particles {
float4 vertex : POSITION;
float3 normal : NORMAL;
float4 color : COLOR;
float4 texcoords : TEXCOORD0;
float texcoordBlend : TEXCOORD1;
};
struct Input {
float2 texcoord;
float2 texcoord1;
float blend;
float4 color;
};
void vert(inout appdata_particles v, out Input o) {
UNITY_INITIALIZE_OUTPUT(Input,o);
o.texcoord = v.texcoords.xy;
o.texcoord1 = v.texcoords.zw;
o.blend = v.texcoordBlend;
o.color = v.color;
}
half _Glossiness;
half _Metallic;
fixed4 _Color;
void surf (Input IN, inout SurfaceOutputStandard o) {
fixed4 colA = tex2D(_MainTex, IN.texcoord);
fixed4 colB = tex2D(_MainTex, IN.texcoord1);
fixed4 c = 2.0f * IN.color * lerp(colA, colB, IN.blend) * _Color;
o.Albedo = c.rgb;
// Metallic and smoothness come from slider variables
o.Metallic = _Metallic;
o.Smoothness = _Glossiness;
o.Alpha = c.a;
}
ENDCG
}
FallBack "Diffuse"
}
In unity 2019 it expects texcoord to be a member of the Input structure instead of uv_MainTex.
Hope it helps others :)